PHOENIX — Gun-store owners in states along the U.S.-Mexico border filed lawsuits this week against the acting director of the federal agency that oversees firearms to halt a new requirement that they alert authorities if someone buys multiple high-powered rifles in a five-day span.

The requirement, which goes into effect Aug. 14, follows a controversial 2009 law enforcement operation in Arizona known as “Fast and Furious” that resulted in more than 2,000 high-powered weapons making their way to Mexico as authorities went after people directing gun buys on behalf of cartels.

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